Ultrasonic Dispersion and Absorption in Freon 113

Additional velocity measurements and first absorption measurements indicate a single relaxation process in freon 113. There is some discrepancy between the relaxation time calculated from velocity dispersion and that from absorption, but the absorption data fit theoretical calculations very well. Calculations indicate that the effect of rotational isomerism is too small to be measured in this vapor with present apparatus. The relaxation time measured in freon 113 at 53°C is 0.53 × 10⁻⁸ sec from absorption data.